EP2116810A3 - Optical displacement measuring device - Google Patents

Optical displacement measuring device Download PDF

Info

Publication number
EP2116810A3
EP2116810A3 EP09250653.4A EP09250653A EP2116810A3 EP 2116810 A3 EP2116810 A3 EP 2116810A3 EP 09250653 A EP09250653 A EP 09250653A EP 2116810 A3 EP2116810 A3 EP 2116810A3
Authority
EP
European Patent Office
Prior art keywords
diffraction grating
imaging element
reflector
measuring device
displacement measuring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09250653.4A
Other languages
German (de)
French (fr)
Other versions
EP2116810B1 (en
EP2116810A2 (en
Inventor
Hideaki Tamiya
Akihiro Kuroda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DMG Mori Co Ltd
Original Assignee
Magnescale Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Magnescale Co Ltd filed Critical Magnescale Co Ltd
Publication of EP2116810A2 publication Critical patent/EP2116810A2/en
Publication of EP2116810A3 publication Critical patent/EP2116810A3/en
Application granted granted Critical
Publication of EP2116810B1 publication Critical patent/EP2116810B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/36—Forming the light into pulses
    • G01D5/38—Forming the light into pulses by diffraction gratings

Abstract

An optical displacement measuring device includes a diffraction grating, a reflecting optical system configured to irradiate two one-time diffracted beams diffracted at the diffraction grating on the diffraction grating again, and the reflecting optical system includes a first imaging element, a second imaging element, a first reflector, and a second reflector, wherein the focal length of the first imaging element and the focal length of the second imaging element are the same, the diffraction grating and first reflector are disposed around the focal position of the first imaging element, and the diffraction grating and second reflector are disposed around the focal position of the second imaging element, thereby suppressing influence of displacement of the diffraction grating as to other than a direction where a movement position is detected.
EP09250653.4A 2008-04-14 2009-03-09 Optical displacement measuring device Active EP2116810B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008105047A JP5095475B2 (en) 2008-04-14 2008-04-14 Optical displacement measuring device

Publications (3)

Publication Number Publication Date
EP2116810A2 EP2116810A2 (en) 2009-11-11
EP2116810A3 true EP2116810A3 (en) 2013-04-10
EP2116810B1 EP2116810B1 (en) 2013-11-27

Family

ID=40911894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09250653.4A Active EP2116810B1 (en) 2008-04-14 2009-03-09 Optical displacement measuring device

Country Status (3)

Country Link
US (1) US7995212B2 (en)
EP (1) EP2116810B1 (en)
JP (1) JP5095475B2 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007023300A1 (en) * 2007-05-16 2008-11-20 Dr. Johannes Heidenhain Gmbh Position measuring device and arrangement thereof
JP5566203B2 (en) * 2010-06-21 2014-08-06 Ｄｍｇ森精機株式会社 Displacement detector
JP5618898B2 (en) * 2010-08-31 2014-11-05 Dmg森精機株式会社 Displacement detector
JP5984555B2 (en) * 2012-07-25 2016-09-06 Dmg森精機株式会社 Displacement detector
JP5984554B2 (en) * 2012-07-25 2016-09-06 Dmg森精機株式会社 Displacement detector
JP6427399B2 (en) * 2014-04-14 2018-11-21 Dmg森精機株式会社 Displacement detection device
JP6386337B2 (en) 2014-10-23 2018-09-05 株式会社ミツトヨ Optical encoder
JP2016142552A (en) * 2015-01-30 2016-08-08 Dmg森精機株式会社 Displacement detection device
CN109916315B (en) * 2019-03-29 2024-02-23 华侨大学 Measuring device based on separation type grating

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185314A (en) * 1986-01-14 1987-07-15 Canon Kk Encoder
US4930895A (en) * 1987-06-15 1990-06-05 Canon Kabushiki Kaisha Encoder for forming interference fringes by re-diffracted lights from an optical type scale and photoelectrically converting the interference fringes to thereby detect the displacement of the scale
US6166817A (en) * 1998-08-20 2000-12-26 Sony Precision Technology Inc. Optical displacement measurement system for detecting the relative movement of a machine part
US20050062981A1 (en) * 2003-09-18 2005-03-24 Industrial Technology Research Institute Apparatus for measuring two-dimensional displacement

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5051579A (en) * 1987-04-03 1991-09-24 Canon Kabushiki Kaisha Optical scale encoder with light intensity alarm
JP2603305B2 (en) * 1988-07-19 1997-04-23 キヤノン株式会社 Displacement measuring device
JPH0450720A (en) * 1990-06-20 1992-02-19 Futaba Corp Optical length measuring instrument
JP2650645B2 (en) * 1996-09-24 1997-09-03 キヤノン株式会社 Optical device
JP4023923B2 (en) * 1998-07-02 2007-12-19 ソニーマニュファクチュアリングシステムズ株式会社 Optical displacement measuring device
US6407815B2 (en) * 1998-07-02 2002-06-18 Sony Precision Technology Inc. Optical displacement measurement system
JP4862108B2 (en) * 2001-02-02 2012-01-25 株式会社森精機製作所 Light emitting / receiving composite unit and displacement detection device using the same
US20030174343A1 (en) * 2002-03-18 2003-09-18 Mitutoyo Corporation Optical displacement sensing device with reduced sensitivity to misalignment
US7187449B2 (en) * 2002-04-26 2007-03-06 Sony Precision Technology Inc. Light-receiving/emitting composite unit, method for manufacturing the same, and displacement detection device
JP4381671B2 (en) * 2002-10-23 2009-12-09 ソニーマニュファクチュアリングシステムズ株式会社 Displacement detector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2185314A (en) * 1986-01-14 1987-07-15 Canon Kk Encoder
US4930895A (en) * 1987-06-15 1990-06-05 Canon Kabushiki Kaisha Encoder for forming interference fringes by re-diffracted lights from an optical type scale and photoelectrically converting the interference fringes to thereby detect the displacement of the scale
US6166817A (en) * 1998-08-20 2000-12-26 Sony Precision Technology Inc. Optical displacement measurement system for detecting the relative movement of a machine part
US20050062981A1 (en) * 2003-09-18 2005-03-24 Industrial Technology Research Institute Apparatus for measuring two-dimensional displacement

Also Published As

Publication number Publication date
US7995212B2 (en) 2011-08-09
JP5095475B2 (en) 2012-12-12
JP2009257841A (en) 2009-11-05
EP2116810B1 (en) 2013-11-27
US20090257066A1 (en) 2009-10-15
EP2116810A2 (en) 2009-11-11

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